The smart thing to do would be to partner with Xbox and allow an extension to add Ubisoft + to Xbox subscribers for a small additional fee.
And is it just me or is Xbox being the more open platform making it slowly but surely THE gaming (non pc) platform to own?
Don't get me wrong I'm kinda pleased because there are good titles from all of these vendors, Sony, UIbisoft, and so on that I enjoy and while I won't do a monthly service the portability to PC will only grow. Or even PC first! (ideally)